Create a metabuild script

[meekee7]

A metabuild system for OpenTrespasser should be created. With the launch of a script, all these tasks should be accomplished:

• Compile the source code in all required configurations
• Run the unit tests and collect the results
• Generate a default INI file with DefaultConfigGenerator
• Create the distributable packages

Key options for implementation include:

• CMake with its CTest and CPack subsystems
• Powershell